News Column

Studies by J. Hernandez-Vargas and Co-Authors Describe New Findings in Applied Polymer Science

June 3, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Data detailed on Applied Polymer Science have been presented. According to news reporting originating from Michoacan, Mexico, by VerticalNews correspondents, research stated, "The dielectric and biological properties of chitosan (CTS)-based nanocomposites were analyzed by dielectric spectroscopy, and antibacterial and antifungal assays. Carbon nanotubes (CNT) and CNT decorated with silver nanoparticles (AgnP) were incorporated into a CTS matrix at different concentrations to obtain bionanocomposite thin films."

Our news editors obtained a quote from the research, "The conductivity of pristine CTS is considerably enhanced, by six orders of magnitude, with the inclusion of CNT; however, with the addition of CNT decorated with AgnP it only increases by two orders of magnitude because of strong chemical interactions between the CNT and AgnP that also affect the antibacterial activity of the composite. The percolation threshold in the CTS/CNT composites is ca. 1.3 wt %, while in CTS/CNT-AgnP composites the strong CNT-AgnP chemical interactions give a percolation threshold of ca. 2.2 wt % of CNT-AgnP. In both cases, DC conductivity exhibits a three-dimensional hopping conductivity, and the sigma- and -relaxation processes are disclosed in agreement with the pristine CTS relaxation processes previously reported; however, these two relaxations vanish in the vicinity of the saturation concentration."

According to the news editors, the research concluded: "Finally, the antifungal activity of the CTS/CNT-AgnP composites is comparable with the activity of other composites, while their antibacterial activity seems to be competitive with respect to commercial antibiotics, indicating the effectiveness of these composites in potential hygienic applications."

For more information on this research see: Chitosan/ MWCNTs-Decorated with Silver Nanoparticle Composites: Dielectric and Antibacterial Characterization. Journal of Applied Polymer Science, 2014;131(9):78-90. Journal of Applied Polymer Science can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell -; Journal of Applied Polymer Science -

The news editors report that additional information may be obtained by contacting J. Hernandez-Vargas, Inst Tecnol Morelia, Biochem Engn Department, Morelia 58120, Michoacan, Mexico. Additional authors for this research include J.B. Gonzalez-Campos, J. Lara-Romero, E. Prokhorov, G. Luna-Barcenas, J.A. Avina-Verduzco and J.C. Gonzalez-Hernandez.

Keywords for this news article include: Mexico, Michoacan, Applied Polymer Science, North and Central America

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Source: Journal of Technology

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